Looks like it is for real - 76042 (for 349.99 - it should be huge).
http://www.thebrickfan.com/lego-marvel-super-heroes-ucs-avengers-helicarrier-confirmed/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+LegoEverlasting-LegoReviewsNews+%28The+Brick+Fan+-+LEGO+Reviews+%26+News%29